Hi, I'm writing a custom tag that will take in two tokens: one
describing an instance of a "Page" object, the other naming the
CharField that I want to retrieve from that specific Page. The tag
would then find that Page object, find the appropriate field, and feed
the context of that field into a template.
Here's my code:
from django import template
from admin_proj.news.models import Article, Page
def do_get_cat_teaser(parser, token):
try:
tag_name, category, slugIDs = token.split_contents()
except ValueError:
raise template.TemplateSyntaxError, "%r tag requires two
arguments" % token.contents.split()[0]
return CatTeaserNode(category, slugIDs)
class CatTeaserNode(template.Node):
def __init__(self, category, slugIDs):
self.category = category
self.slugIDs = slugIDs
def render(self, context):
catpage = Page.objects.get(category=self.category)
#Page objects have a "category" field
slug_list = catpage.slugIDs #slugIDs is the variable
representing the field name in the Page object
group = Article.objects.filter(pk__in=slug_list) #that
field contains a list of slugs, which is Article's PK
t = template.loader.get_template('teaser.html')
return t.render(Context({'group': group},
autoescape=context.autoescape))
register.tag('get_cat_teaser', do_get_cat_teaser)
1. Everything seems to work up until "catpage = Page.objects.get
(category=self.category), when I get a "Page matching query does not
exist." error.
2. It's obviously not letting me pass "slugIDs" as a field identifier
to the catpage object (from "slug_list = catpage.slugIDs"). Is it
possible to use a variable to identify a field name?
Thanks for your help,
Michael
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